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Guidance on APIs and how to find commercial software suppliers for different HMRC online services.
Guide to licensing requirements and restrictions for trade control and the export of controlled military goods, software and technology.
Find guidance and technical specifications for software developers on the IRmark.
Take free official practice theory tests from the Driver and Vehicle Standards Agency (DVSA) for cars, motorcycles, lorries and buses
How to file your company annual accounts with Companies House
Find software developers that can help with entry summary declarations including safety and security declarations for imports.…
Use this guidance to create your products if you're a HMRC software developer or substitute form producer.
How to send information to Companies House through our extensible markup language (XML) schemas, by purchasing software or developing your own.
Find Document Submission Protocol guidance for architects, software developers and other parties interested in building Transaction Engine client applications.
Technical specifications for software developers working with the Agent Authorisation Online service.
Support and technical specifications for software developers working with the Charities Online service in making repayment claims.…
Find technical specifications for software developers working with the Stamp Taxes Online service.
Technical specifications for New Computerised Transit System (NCTS) software developers.
Download HMRC's free payroll software Basic PAYE Tools
Technical specifications for software developers working with the EC Sales List online service.
Find technical specifications for Alcohol and Tobacco Warehousing Declaration (ATWD) software developers.
Find technical specifications and support for software developers working with the Construction Industry Scheme Online service.
Use Self Assessment software to help you populate your client's Self Assessment tax return if you're a tax agent or adviser.
File changes to your company information including directors, shareholders and registered office address, and where your company records are kept
Guide to licensing procedure and other restrictions for export of controlled dual-use items, software and technology, goods for torture and radioactive sources.
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